Yougigun

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

Yougigun

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

Yougigun

visited = set()
def depth_first_search(graph,node):
    if (node in visited): return 
    visited.add(node)
    print(node)
    for adjacent_node in graph[node]:
        depth_first_search(graph,adjacent_node)
        
graph = dict()
graph["1"] = ["2","3"]

Yougigun

import React,{useState} from 'react'
import classes from './Promotion.module.css'
import ChineseChessTable from './ChineseChessTable/ChineseChessTable'


const ChineseChess = () => {
    const [carPosition, setCarPosition] = useState({x:0,y:0})
    const [carInputX, setCarInputX] = useState(0)
    const [carInputY, setCarInputY] = useState(0)

Yougigun

import React from 'react'

const ChineseChessTable = ({Size,CarPos}) => {
    let tableTD =[]
    let table = []
    let tdOfCar = []
    for (let y = 0;y<=Size.y;y++){
        tableTD.push(<td></td>)
    }
    for (let y = 0;y<=Size.y;y++){

Yougigun

package main

import (
	"context"
	"fmt"
	"runtime"
	"time"
)

func main() {

Yougigun

{
    "python.pythonPath": "C:\\Anaconda3\\envs\\kedro-practice\\python.exe",
    "python.terminal.activateEnvironment": true,
    "python.condaPath":"C:\\Anaconda3\\Scripts\\conda.exe"
}

Yougigun

{
    "python.pythonPath": "C:\\Anaconda3\\envs\\kedro-practice\\python.exe",
    "python.terminal.activateEnvironment": true,
    "python.condaPath":"C:\\Anaconda3\\Scripts\\conda.exe"
}

Yougigun

import React, {useEffect,useState}from 'react';

import Modal from '../../components/UI/Modal/Modal'
import Aux from '../Auxiliary/Auxiliary'


const withErrorHandler = (WrappedComponent,axios) => {

    return (props)=>{
        const [state, setstate] = useState({error:null})

Yougigun

let completed = true;

let learnJS = new Promise(function (resolve, reject) {
    if (completed) {
        resolve("I have completed learning JS.");
    } else {
        reject("I haven't completed learning JS yet.");
    }
});